<!doctype html>
<html lang="en"> <head>
<meta charset="UTF-8">
<meta name="viewport"
 content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>计算器示例</title>
</head> <body>
<form action="/calc">
  <h1>正淳牌计算器</h1>
<input name="num1" type="text"><br>
<input name="num2" type="text"><br>
<input type="submit" value=" 点击相加 ">
</form>
<img src="img.png">
</body>
</html>